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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        // getSalary(12000,2000)
        // getSalary(15000,3000)
        // getSalary(15000,4000)
        function makeSalary(base){
            return function(performance){
                return base + performance
            }
        }
        let salaryLevel1 = makeSalary(12000)
        let salaryLevel2 = makeSalary(15000)

        console.log(salaryLevel1(2000))
        console.log(salaryLevel2(3000))
    </script>
</body>
</html>